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LG 50LB6500 No backlight, image on screen, right side bad picture

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    #21
    Re: LG 50LB6500 No backlight, image on screen, right side bad picture

    Originally posted by garry7263 View Post
    Wish I had a microscope. I am going to have to trace that DRV-ON back to the main board and look for a bad voltage regulator or chip? Something has to send it more voltage.
    Those control signals usually come directly from the main processor. You can try heating it with a hair dryer before plugging it in.
    Last edited by neilc6; 10-24-2019, 02:32 PM.

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      #22
      Re: LG 50LB6500 No backlight, image on screen, right side bad picture

      You can try just disconnecting the DRV-ON cable only from the power supply side and then use a 1K resistor between the DRV-ON pin of the power supply and Standby power supply pin to force on the backlights and see if the backlights will come on and stay on or not and the image and sound are OK or not.
      Never stop learning
      Basic LCD TV and Monitor troubleshooting guides.
      http://www.badcaps.net/forum/showthr...956#post305956

      Voltage Regulator (LDO) testing:
      http://www.badcaps.net/forum/showthr...999#post300999

      Inverter testing using old CFL:
      http://www.badcaps.net/forum/showthr...er+testing+cfl

      Tear down pictures : Hit the ">" Show Albums and stories" on the left side
      http://s807.photobucket.com/user/budm/library/

      TV Factory reset codes listing:
      http://www.badcaps.net/forum/showthread.php?t=24809

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        #23
        Re: LG 50LB6500 No backlight, image on screen, right side bad picture

        Sorry for so late of a reply, my mother went to the hospital so a little scatterbrained atm.

        Bud, I tried forcing the DRV-ON but it didn't work. I found a replacement power and main board for $30 and got them today. So I have $55 in the set now but it needs legs and a remote. Set works great though.

        Other boards could have worked with the set but would miss out on the 3D and other options. Boards I got were direct replacement with matching part numbers.

        I have a few other TVs that need some attention atm. I do know that despite the backlights, there were vertical lines on the whole screen so the main board was screwed. When I have time I will try to troubleshoot the the other boards and try to fix them since I am trying to learn.

        Thank you everyone for the help.

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          #24
          Re: LG 50LB6500 No backlight, image on screen, right side bad picture

          Hope your mom is ok. Are you sure that your original powerboard is bad? may have just been the mainboard.

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            #25
            Re: LG 50LB6500 No backlight, image on screen, right side bad picture

            Probably just the main but I got them both for $30 out of a set with a broken screen, so I just swapped out both. Will tinker with the others when I have time.

            By the way, thank you for the condolences. She is very weak and keeps ripping her IVs out.

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